Brake-rod jaw.



E. SCHAEFER. BRAKE RODJAW. APPLICATION fl-LED AUG. 19. I916.

Patented Mar. 19, 1918.

WITNESSES FBEDEBIC SCHAEFER, OF PITTSBURGH, PENNSYLVANIA.

- BRAKE-non JAW.

Specification of Letters Patent.

Patented Mar. 19, 1918.

Application filed August 19, 1916. Serial No. 115,789.

To all whom it may concern:

Be it known that I, FREDERIO ScHAnrnR,

a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Brake-Rod Jaws, of which the following s a specification.

This invention relates to improvements i1 brake rod jaws.

One of the objects of the in veution is to provide an improved brake rod jaw which can be readily formed by forging and hence be made much stronger than similar jaws made of cast metal.

Another object is to provide an improved 'aw in which a minimum amount of metal is used which is so disposed that the jaw will withstand all service stresses without danger of deformation or breakage.

Anotherobject is to provide an improved brake rod jaw which can be readily formed in proper shape withoutrequiring diflicult and expensive manufacturing operations.

The accompan ing drawings illustrate an embodiment of t e invention. The views of said drawings are as follows Figure 1 is a top plan view of the brake rod jaw with one ofthe jaw members thereof shown in cross section."

Fig. '2 is aside elevation and partial cross section of the jaw shown in Fig. 1.

Fig. 3 is a'bottom plan view of the brake rod jaw. v

Fig. 4 is an end view.

Fig. 5 is a cross section on the line 55 of Flg. 2.

Fig. 6 is a cross section on the line of Fig. 2.

The jaw is formed from a single piece of metal, preferably a rolled plate of rect:.mgular outline, although if desired the plate may be sheared to approximately the form of the blank out of which the jaw is made. This metal plate is then subjected to the action of suitably formed dies which trim out the plate and roperly shape it. The dies trim out the p ate so as to form two sidemembers 1 and 2 which are joined by an upwardly bowed portion 3 at one end and a. downwardly bowed portion 4 intermediate the ends. The side members or wings 1 and 2 are bent downwardly by the dies so as to dispose them side by side and substantially parallel to each other with the two connecting portions 3and 4 located as shown in Fig. 2 so that there is an opening therebetween, as at 5, through which the end of the brake rod 6 may pass. Figs. 4 and 5 illustrate the position of the side members before they are bent downwardly by the dies to their final position.

In the die operation the excess metal from the portions which are cut away is caused in part to flow into the blank so as to form thickened portions at certain points in order to give maximum strength with a minimum amount of material. For example, the metal around the openings 7 in the eyes 8 at the ends of the side ortions is thickened, as at 9. The edges of the blank are also turned down to form flanges 10 for strengthening the jaw.

The brake rod 6 is connected to the jaw by heating its end and passing it through the opening 5 until it projects entirely beyond the forward end of the jaw and it is then bent into hooked form and moved backwardly until the hook end 11 engages the downwardl bowed portion 4 of the jaw. The end 0 the rod is then bent around the bowed portlon 4 until it engages the body portion of the 'rod, as illustrated in Fig. 2. The brake rod thus grips the bowed portion and is prevented from moving longitudinally in the jaw.

In order to hold the brake rod more firmly in position, the jaw is provided with integral projections 12 and 13 which, in efiect,

form extensions of .the upwardly bowed portion 3 and are arran ed to be bentaround the end 11 of the bra erod. These projections or extensions are formed parallel to each other on the jaw, as shown in dotted lines in Fig. 4. After the brake rod is positioned in the jaw, they are bent around the end 11 of the rod, as shown in Fig. 4, to hold it in position. The projections are shaped so that they overla in the manner shown in Fig. 3, which al ows them to be bent around the brake rod and firmly grasp it without requiring that they be of exact size and shape so as to match each other and form a joint. This construction is very practical because it is difiicult to form the projections so that they will meet each other and allow a proper opening for the rod, the expansion and contraction of the metal and variations in sizes of the rods serving to make it diflicult to have the projections meet to form a joint. The projections overlapping in approximately the same plane transverselyon the rod, increases the locking strength.

Any tendency of the brake rod to straighten out under severe tension strains is resisted by the bent-over portions 12 and 13 which clasp the end of the rod. The metal is sufliclently rigid to offer a very material resistance to any straightening out tendency of the hook and .no weld at the edges of the extensions is necessary because the tendency to spread apart these members is very slight and is amply taken care of by the stiffness of the metal.

The structure of the brake jaw is such that it can be readily formed by die forging,

1. A forged brakerod jaw composed of wrought metal and comprising jaw members lyingside by side and connected'by an upwardly bowed portion and a downwardly bowedportion, said latterportion serving as a means for engaging a hooked brake rod andpermitting the end of the rod to be bent into engagement with the rod body, and means on the jaw capable of-being readily bent around the end of the-rod to hold it in position.

2.'A forged brake rod jaw composed of wrought metal and comprising jaw members lying side by side' and connected by an upwardly bowed portion and a downwardly bowed portion,'said latter portion serving as a means for engaging a hooked brake rod end and-permitting the end .of therod to be bent in a plane parallel to the plane of the side members into engagement with the rod body, and means on the jaw for preventing displacement of the hooked end ofthe brake rod. I

3. A forged bra-he rod jaw composed of wrought metal and comprising jaw members lying side by side and connected by an upwardly bowed portion and a downwardly bowed portion, said latter portion serving as a means for engaging a hooked brake rod end and permitting the end of the rod to be bent into engagement with the rod body, and means integral with the jaw for preventing displacement of the hooked end of the brake rod. r

4. A forged brake rod jaw composed of wrought metal and comprising jaw members lying side by side and connected by an upwardly bowed portion and a downwardly bowed portion, said latter portion serving as a means for engaging a hooked brake rodwardly bowed portion intermediate the ends,

said latter portion serving as a means for en sing a hooked brake rod end, and ears on the end of the jaw having the upwardly bowed portion arranged to be bent into engagement with the end of the brake'rod to hold the rod in position. 1

6. A forged brake rod jaw composed of wrought metal and comprising jaw members lying side by side and connected by an-upwardly bowed portion and a downwardly bowed portion, said latter portion serving as a means for. engaging a hooked brake rod end and permitting the endof the brake rod tobe bent into engagement with the rod body, and ears extending from the jaw having their ends cut at an angleso that-they may be readily bent to an overlapping position around the brake rod.

7. A forged brake rod jaw composed of a single piece of wrought metal and comprising side members spacedapartin substantially parallel relation and joined by an upwardly bowed portion at one end and a downwardly bowed portion adjacent said end whereby an opening is formed for receiving a brake rod, said downwardly bowed portion serving as a means for engaging the hooked end of a brake rod and permitting the end of said rod to be bent into engagement with the rod body, and proections extending from the side'members at their ends which are joined by the upwardly bowed portion adapted to be-bent around the end of the brake rod to hold it in position.

8. A forged brake rod jaw composed of a single piece of wrought metal and comprising side members spaced apart in substantially parallel relation and joined by an upwardly bowed portion at one end and a downwardly bowed portion adjacent said ends, whereby an opening is formed for receiving a brake rod, said downwardly bowed portion serving asa means for engaging the hooked end of the brake rod and permitting the end of said rod to be bent into engagement with the rod body, and projections extending from the side members at their ends which of the brake rod for holding it in position,

the ends of said projections being cut at an angle so that they may be madlly' bent to overlap on the rod. withoufioverlap'ping each other.

J In testimony whereof, I have hereunto setmy hand.

Witnessesi SUE B. FRITZ,

L SOHANTZ.

hFREDERIC SC AE ERQ 

